Construction of Fe 3 O 4 /MoS 2 -O/biochar heterostructure with visible light-driven photodegradation of levofloxacin and sterilization activity: efficiency, reaction pathway, and mechanism
Biomass Conversion and Biorefinery(2024)
摘要
There are few studies on using spent mushroom substrates to fabricate magnetic photocatalysts. In this paper, biochar (BC) was coupled with Fe 3 O 4 /MoS 2 -O to form a magnetic heterostructure (Fe 3 O 4 /MoS 2 -O/BC) using the hydrothermal method. Under the visible light irradiation, Fe 3 O 4 /MoS 2 -O@BC-4 exhibited a high level of photocatalytic activity in the degradation of Levofloxacin (LVX), achieving approximately 90.64% degradation within 80 min. Furthermore, Fe 3 O 4 /MoS 2 -O@BC-4 demonstrated a removal efficiency exceeding 99% for Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) within a mere 20 min under visible light exposure. Additionally, the inclusion of Fe 3 O 4 contributes to the material’s recyclability and facilitates the formation of II-scheme heterojunction. Due to the oxygen doping and heterojunction, the electron–hole pairs within Fe 3 O 4 /MoS 2 -O@BC were efficiently separated. The trapping experiment of reactive species and electron spin resonance (ESR) test confirms that the ·OH and O 2 − are the major active species in photocatalytic sterilization. This study introduces novel magnetic photocatalysts for environmental remediation based on the application of biomass resources.
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关键词
Biochar,MoS2-O,Magnetic photocatalysts,Levofloxacin,S. aureus,Degradation
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